La vida media de un isótopo radiactivo es el tiempo que le toma a una cantidad cualquiera del isótopo reducirse a la mitad de su masa inicial. si comenzamos con gramos de un isótopo radiactivo, ¿cuánto quedará después de vidas medias? utilizar la calculadora proporcionada y redondear la respuesta al gramo más cercano.

Instructions: create a public service announcement in spanish on severe weather procedures to encourage the community to be prepared. use the graphic organizer to organize your ideas and to write the vocabulary that you need to create your public service announcement. refer to pages 1, 2 and 3 of the lesson area for terms and ideas to you fill out the organizer and, ultimately, create your psa. this announcement can be a flyer, a radio message, or a tv message. you can select the severe weather event that is approaching or imminent. describe the severe weather event and tell the community how to protect themselves before, during, or after the weather event. include at least 10 ideas related to the severe weather event and the procedures to get prepared